The payment a seller sends you goes to paypal, who'll automatically take their fee's straight off, aboout 8-9% iirc.
That depends on the type of paypal account you have. If you have a normal one, where you mostly buy or something, its only like2-3%, but it goes up if you sell boatloads of stuff, as your account type is changed.
Hmmm, usually, eBay is pretty good. One time I sold something, for like, 12 bucks shipped, and the moron sent me a message "money order sent, please ship the game right away!". Of course, I didn't send it, I never got a money order, and the guy was "no longer a registered ebay member" within like a week. NEVER ship before payment is received and cleared. My only other bad expreince I can remember is I bought a cylinder kit for $110 shipped, and the asshole sold me a faulty kit, it burned up after 50 miles, and then he refused to replace it, AND when he told me he would fix the cylinder, he later told me no, its not possible anymore, AFTER i shipped it. He did not want to invoice me, he want me to stick $10 in the package for return shipping (didnt do that). The guy was full of shit, twisted words (and failed), changed what he said every other emailed, called me names, bragged about his bachelors business degree (which he bragged about getting in 8 years...pretty good considering it only takes 4 years

) found out that my dad had bought some sort of kit 3 years ago (feedback said something about a kit not working, and the kit was not even a cylinder kit) and said "And you claimed you had the same problems, so whats up with that" or something. Well in the end, i called ebay, and got my money back LOL!